1836 lines
80 KiB
C
1836 lines
80 KiB
C
|
|
/* png.h - header file for PNG reference library
|
|
|
|
libpng 1.0 beta 6 - version 0.96
|
|
For conditions of distribution and use, see copyright notice in png.h
|
|
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
|
Copyright (c) 1996, 1997 Andreas Dilger
|
|
May 12, 1997
|
|
|
|
BETA NOTICE:
|
|
This is a beta version. It reads and writes valid files on the
|
|
platforms I have, and has had a wide testing program. You may
|
|
have to modify the includes below to get it to work on your
|
|
system, and you may have to supply the correct compiler flags in
|
|
the makefile if you can't find a makefile suitable for your
|
|
operating system/compiler combination. Read libpng.txt for more
|
|
information, including how to contact the authors if you have any
|
|
problems, or if you want your compiler/platform to be supported in
|
|
the next official libpng release.
|
|
|
|
See libpng.txt for more information.
|
|
|
|
Contributing Authors:
|
|
John Bowler
|
|
Sam Bushell
|
|
Kevin Bracey
|
|
Andreas Dilger
|
|
Magnus Holmgren
|
|
Dave Martindale
|
|
Greg Roelofs
|
|
Guy Eric Schalnat
|
|
Paul Schmidt
|
|
Tom Tanner
|
|
Tim Wegner
|
|
|
|
The contributing authors would like to thank all those who helped
|
|
with testing, bug fixes, and patience. This wouldn't have been
|
|
possible without all of you.
|
|
|
|
Thanks to Frank J. T. Wojcik for helping with the documentation.
|
|
|
|
The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
|
and Group 42, Inc. disclaim all warranties, expressed or implied,
|
|
including, without limitation, the warranties of merchantability and of
|
|
fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
|
assume no liability for direct, indirect, incidental, special, exemplary,
|
|
or consequential damages, which may result from the use of the PNG
|
|
Reference Library, even if advised of the possibility of such damage.
|
|
|
|
Permission is hereby granted to use, copy, modify, and distribute this
|
|
source code, or portions hereof, for any purpose, without fee, subject
|
|
to the following restrictions:
|
|
1. The origin of this source code must not be misrepresented.
|
|
2. Altered versions must be plainly marked as such and must not be
|
|
misrepresented as being the original source.
|
|
3. This Copyright notice may not be removed or altered from any source or
|
|
altered source distribution.
|
|
|
|
The Contributing Authors and Group 42, Inc. specifically permit, without
|
|
fee, and encourage the use of this source code as a component to
|
|
supporting the PNG file format in commercial products. If you use this
|
|
source code in a product, acknowledgment is not required but would be
|
|
appreciated.
|
|
*/
|
|
|
|
#ifndef _PNG_H
|
|
#define _PNG_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/* This is not the place to learn how to use libpng. The file libpng.txt
|
|
* describes how to use libpng, and the file example.c summarizes it
|
|
* with some code on which to build. This file is useful for looking
|
|
* at the actual function definitions and structure components.
|
|
*/
|
|
|
|
/* include the compression library's header */
|
|
#include "zlib.h"
|
|
|
|
/* include all user configurable info */
|
|
#include "pngconf.h"
|
|
|
|
/* This file is arranged in several sections. The first section contains
|
|
* structure and type definitions. The second section contains the external
|
|
* library functions, while the third has the internal library functions,
|
|
* which applications aren't expected to use directly.
|
|
*/
|
|
|
|
/* Version information for png.h - this should match the version in png.c */
|
|
#define PNG_LIBPNG_VER_STRING "0.96"
|
|
|
|
/* careful here. At one time, I wanted to use 082, but that would be octal.
|
|
* Version 1.0 will be 100 here, etc.
|
|
*/
|
|
#define PNG_LIBPNG_VER 96
|
|
|
|
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|
#ifndef PNG_NO_EXTERN
|
|
/* Version information for C files, stored in png.c. This had better match
|
|
* the version above.
|
|
*/
|
|
extern char png_libpng_ver[];
|
|
|
|
/* Structures to facilitate easy interlacing. See png.c for more details */
|
|
extern int FARDATA png_pass_start[];
|
|
extern int FARDATA png_pass_inc[];
|
|
extern int FARDATA png_pass_ystart[];
|
|
extern int FARDATA png_pass_yinc[];
|
|
extern int FARDATA png_pass_mask[];
|
|
extern int FARDATA png_pass_dsp_mask[];
|
|
/* These aren't currently used. If you need them, see png.c for more details
|
|
extern int FARDATA png_pass_width[];
|
|
extern int FARDATA png_pass_height[];
|
|
*/
|
|
#endif /* PNG_NO_EXTERN */
|
|
|
|
/* Three color definitions. The order of the red, green, and blue, (and the
|
|
* exact size) is not important, although the size of the fields need to
|
|
* be png_byte or png_uint_16 (as defined below).
|
|
*/
|
|
typedef struct png_color_struct
|
|
{
|
|
png_byte red;
|
|
png_byte green;
|
|
png_byte blue;
|
|
} png_color;
|
|
typedef png_color FAR * png_colorp;
|
|
typedef png_color FAR * FAR * png_colorpp;
|
|
|
|
typedef struct png_color_16_struct
|
|
{
|
|
png_byte index; /* used for palette files */
|
|
png_uint_16 red; /* for use in red green blue files */
|
|
png_uint_16 green;
|
|
png_uint_16 blue;
|
|
png_uint_16 gray; /* for use in grayscale files */
|
|
} png_color_16;
|
|
typedef png_color_16 FAR * png_color_16p;
|
|
typedef png_color_16 FAR * FAR * png_color_16pp;
|
|
|
|
typedef struct png_color_8_struct
|
|
{
|
|
png_byte red; /* for use in red green blue files */
|
|
png_byte green;
|
|
png_byte blue;
|
|
png_byte gray; /* for use in grayscale files */
|
|
png_byte alpha; /* for alpha channel files */
|
|
} png_color_8;
|
|
typedef png_color_8 FAR * png_color_8p;
|
|
typedef png_color_8 FAR * FAR * png_color_8pp;
|
|
|
|
/* png_text holds the text in a PNG file, and whether they are compressed
|
|
in the PNG file or not. The "text" field points to a regular C string. */
|
|
typedef struct png_text_struct
|
|
{
|
|
int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */
|
|
png_charp key; /* keyword, 1-79 character description of "text" */
|
|
png_charp text; /* comment, may be an empty string (ie "") */
|
|
png_size_t text_length; /* length of "text" field */
|
|
} png_text;
|
|
typedef png_text FAR * png_textp;
|
|
typedef png_text FAR * FAR * png_textpp;
|
|
|
|
/* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
|
|
#define PNG_TEXT_COMPRESSION_NONE_WR -3
|
|
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
|
|
#define PNG_TEXT_COMPRESSION_NONE -1
|
|
#define PNG_TEXT_COMPRESSION_zTXt 0
|
|
#define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */
|
|
|
|
/* png_time is a way to hold the time in an machine independent way.
|
|
Two conversions are provided, both from time_t and struct tm. There
|
|
is no portable way to convert to either of these structures, as far
|
|
as I know. If you know of a portable way, send it to me. As a side
|
|
note - PNG is Year 2000 compliant! */
|
|
typedef struct png_time_struct
|
|
{
|
|
png_uint_16 year; /* full year, as in, 1995 */
|
|
png_byte month; /* month of year, 1 - 12 */
|
|
png_byte day; /* day of month, 1 - 31 */
|
|
png_byte hour; /* hour of day, 0 - 23 */
|
|
png_byte minute; /* minute of hour, 0 - 59 */
|
|
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|
} png_time;
|
|
typedef png_time FAR * png_timep;
|
|
typedef png_time FAR * FAR * png_timepp;
|
|
|
|
/* png_info is a structure that holds the information in a PNG file so
|
|
* that the application can find out the characteristics of the image.
|
|
* If you are reading the file, this structure will tell you what is
|
|
* in the PNG file. If you are writing the file, fill in the information
|
|
* you want to put into the PNG file, then call png_write_info().
|
|
* The names chosen should be very close to the PNG specification, so
|
|
* consult that document for information about the meaning of each field.
|
|
*
|
|
* With libpng < 0.95, it was only possible to directly set and read the
|
|
* the values in the png_info_struct, which meant that the contents and
|
|
* order of the values had to remain fixed. With libpng 0.95 and later,
|
|
* however, * there are now functions which abstract the contents of
|
|
* png_info_struct from the application, so this makes it easier to use
|
|
* libpng with dynamic libraries, and even makes it possible to use
|
|
* libraries that don't have all of the libpng ancillary chunk-handing
|
|
* functionality.
|
|
*
|
|
* In any case, the order of the parameters in png_info_struct should NOT
|
|
* be changed for as long as possible to keep compatibility with applications
|
|
* that use the old direct-access method with png_info_struct.
|
|
*/
|
|
typedef struct png_info_struct
|
|
{
|
|
/* the following are necessary for every PNG file */
|
|
png_uint_32 width; /* width of image in pixels (from IHDR) */
|
|
png_uint_32 height; /* height of image in pixels (from IHDR) */
|
|
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
|
|
png_size_t rowbytes; /* bytes needed to hold an untransformed row */
|
|
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
|
|
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
|
|
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
|
|
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
|
|
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
|
|
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
|
|
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
|
|
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
|
|
/* The following is informational only on read, and not used on writes. */
|
|
png_byte channels; /* number of data channels per pixel (1, 3, 4)*/
|
|
png_byte pixel_depth; /* number of bits per pixel */
|
|
png_byte spare_byte; /* to align the data, and for future use */
|
|
png_byte signature[8]; /* magic bytes read by libpng from start of file */
|
|
|
|
/* The rest of the data is optional. If you are reading, check the
|
|
* valid field to see if the information in these are valid. If you
|
|
* are writing, set the valid field to those chunks you want written,
|
|
* and initialize the appropriate fields below.
|
|
*/
|
|
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
|
|
/* The gAMA chunk describes the gamma characteristics of the system
|
|
* on which the image was created, normally in the range [1.0, 2.5].
|
|
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
|
|
*/
|
|
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
|
|
#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
|
|
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
|
/* The tEXt and zTXt chunks contain human-readable textual data in
|
|
* uncompressed and compressed forms, respectively. The data in "text"
|
|
* is an array of pointers to uncompressed, null-terminated C strings.
|
|
* Each chunk has a keyword which describes the textual data contained
|
|
* in that chunk. Keywords are not required to be unique, and the text
|
|
* string may be empty. Any number of text chunks may be in an image.
|
|
*/
|
|
int num_text; /* number of comments read/to write */
|
|
int max_text; /* current size of text array */
|
|
png_textp text; /* array of comments read/to write */
|
|
#endif /* PNG_READ_tEXt/zTXt_SUPPORTED || PNG_WRITE_tEXt/zTXt_SUPPORTED */
|
|
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
|
|
/* The tIME chunk holds the last time the displayed image data was
|
|
* modified. See the png_time struct for the contents of this struct.
|
|
*/
|
|
png_time mod_time;
|
|
#endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
|
|
/* The sBIT chunk specifies the number of significant high-order bits
|
|
* in the pixel data. Values are in the range [1, bit_depth], and are
|
|
* only specified for the channels in the pixel data. The contents of
|
|
* the low-order bits is not specified. Data is valid if
|
|
* (valid & PNG_INFO_sBIT) is non-zero.
|
|
*/
|
|
png_color_8 sig_bit; /* significant bits in color channels */
|
|
#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
|
|
/* The tRNS chunk supplies transparency data for paletted images and
|
|
* other image types that don't need a full alpha channel. There are
|
|
* "num_trans" transparency values for a paletted image, stored in the
|
|
* same order as the palette colors, starting from index 0. Values
|
|
* for the data are in the range [0, 255], ranging from fully transparent
|
|
* to fully opaque, respectively. For non-paletted images, there is a
|
|
* single color specified which should be treated as fully transparent.
|
|
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
|
|
*/
|
|
png_bytep trans; /* transparent values for paletted image */
|
|
png_color_16 trans_values; /* transparent color for non-palette image */
|
|
#endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
|
|
/* The bKGD chunk gives the suggested image background color if the
|
|
* display program does not have its own background color and the image
|
|
* is needs to composited onto a background before display. The colors
|
|
* in "background" are normally in the same color space/depth as the
|
|
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
|
|
*/
|
|
png_color_16 background;
|
|
#endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
|
|
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
|
|
* and downwards from the top-left corner of the display, page, or other
|
|
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
|
|
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
|
|
*/
|
|
png_uint_32 x_offset; /* x offset on page */
|
|
png_uint_32 y_offset; /* y offset on page */
|
|
png_byte offset_unit_type; /* offset units type */
|
|
#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
|
|
/* The pHYs chunk gives the physical pixel density of the image for
|
|
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
|
|
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
|
|
*/
|
|
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
|
|
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
|
|
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
|
|
#endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
|
|
#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
|
|
/* The hIST chunk contains the relative frequency or importance of the
|
|
* various palette entries, so that a viewer can intelligently select a
|
|
* reduced-color palette, if required. Data is an array of "num_palette"
|
|
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
|
|
* is non-zero.
|
|
*/
|
|
png_uint_16p hist;
|
|
#endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
|
|
/* The cHRM chunk describes the CIE color characteristics of the monitor
|
|
* on which the PNG was created. This data allows the viewer to do gamut
|
|
* mapping of the input image to ensure that the viewer sees the same
|
|
* colors in the image as the creator. Values are in the range
|
|
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
|
|
*/
|
|
float x_white;
|
|
float y_white;
|
|
float x_red;
|
|
float y_red;
|
|
float x_green;
|
|
float y_green;
|
|
float x_blue;
|
|
float y_blue;
|
|
#endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
|
|
/* The pCAL chunk describes a transformation between the stored pixel
|
|
* values and original physcical data values used to create the image.
|
|
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
|
|
* range given by [pcal_X0, pcal_X1], and are further transformed by a
|
|
* (possibly non-linear) transformation function given by "pcal_type"
|
|
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
|
|
* defines below, and the PNG-Group's Scientific Visualization extension
|
|
* chunks document png-scivis-19970203 for a complete description of the
|
|
* transformations and how they should be implemented, as well as the
|
|
* png-extensions document for a description of the ASCII parameter
|
|
* strings. Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
|
|
*/
|
|
png_charp pcal_purpose; /* pCAL chunk description string */
|
|
png_int_32 pcal_X0; /* minimum value */
|
|
png_int_32 pcal_X1; /* maximum value */
|
|
png_charp pcal_units; /* Latin-1 string giving physical units */
|
|
png_charpp pcal_params; /* ASCII strings containing parameter values */
|
|
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
|
|
png_byte pcal_nparams; /* number of parameters given in pcal_params */
|
|
#endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
|
|
} png_info;
|
|
typedef png_info FAR * png_infop;
|
|
typedef png_info FAR * FAR * png_infopp;
|
|
|
|
/* These describe the color_type field in png_info. */
|
|
/* color type masks */
|
|
#define PNG_COLOR_MASK_PALETTE 1
|
|
#define PNG_COLOR_MASK_COLOR 2
|
|
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
|
/* color types. Note that not all combinations are legal */
|
|
#define PNG_COLOR_TYPE_GRAY 0
|
|
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
|
|
/* This is for compression type. PNG 1.0 only defines the single type. */
|
|
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
|
|
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
|
|
|
|
/* This is for filter type. PNG 1.0 only defines the single type. */
|
|
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
|
|
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
|
|
|
|
/* These are for the interlacing type. These values should NOT be changed. */
|
|
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
|
|
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
|
|
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
|
|
|
|
/* These are for the oFFs chunk. These values should NOT be changed. */
|
|
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
|
|
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
|
|
#define PNG_OFFSET_LAST 2 /* Not a valid value */
|
|
|
|
/* These are for the pCAL chunk. These values should NOT be changed. */
|
|
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
|
|
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
|
|
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
|
|
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
|
|
#define PNG_EQUATION_LAST 4 /* Not a valid value */
|
|
|
|
/* These are for the pHYs chunk. These values should NOT be changed. */
|
|
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
|
|
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
|
|
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
|
|
|
|
/* These determine if an ancillary chunk's data has been successfully read
|
|
* from the PNG header, or if the application has filled in the corresponding
|
|
* data in the info_struct to be written into the output file. The values
|
|
* of the PNG_INFO_<chunk> defines should NOT be changed.
|
|
*/
|
|
#define PNG_INFO_gAMA 0x0001
|
|
#define PNG_INFO_sBIT 0x0002
|
|
#define PNG_INFO_cHRM 0x0004
|
|
#define PNG_INFO_PLTE 0x0008
|
|
#define PNG_INFO_tRNS 0x0010
|
|
#define PNG_INFO_bKGD 0x0020
|
|
#define PNG_INFO_hIST 0x0040
|
|
#define PNG_INFO_pHYs 0x0080
|
|
#define PNG_INFO_oFFs 0x0100
|
|
#define PNG_INFO_tIME 0x0200
|
|
#define PNG_INFO_pCAL 0x0400
|
|
|
|
/* This is used for the transformation routines, as some of them
|
|
* change these values for the row. It also should enable using
|
|
* the routines for other purposes.
|
|
*/
|
|
typedef struct png_row_info_struct
|
|
{
|
|
png_uint_32 width; /* width of row */
|
|
png_size_t rowbytes; /* number of bytes in row */
|
|
png_byte color_type; /* color type of row */
|
|
png_byte bit_depth; /* bit depth of row */
|
|
png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|
png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|
} png_row_info;
|
|
|
|
typedef png_row_info FAR * png_row_infop;
|
|
typedef png_row_info FAR * FAR * png_row_infopp;
|
|
|
|
/* These are the function types for the I/O functions, and the functions which
|
|
* modify the default I/O functions to user I/O functions. The png_error_ptr
|
|
* type should match that of user supplied warning and error functions, while
|
|
* the png_rw_ptr type should match that of the user read/write data functions.
|
|
*/
|
|
typedef struct png_struct_def png_struct;
|
|
typedef png_struct FAR * png_structp;
|
|
|
|
typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp));
|
|
typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
|
|
typedef void (*png_flush_ptr) PNGARG((png_structp));
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop));
|
|
typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop));
|
|
typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
|
|
png_uint_32, int));
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
/* The structure that holds the information to read and write PNG files.
|
|
* The only people who need to care about what is inside of this are the
|
|
* people who will be modifying the library for their own special needs.
|
|
* It should NOT be accessed directly by an application, except to store
|
|
* the jmp_buf.
|
|
*/
|
|
|
|
struct png_struct_def
|
|
{
|
|
jmp_buf jmpbuf; /* used in png_error */
|
|
|
|
png_error_ptr error_fn; /* function for printing errors and aborting */
|
|
png_error_ptr warning_fn; /* function for printing warnings */
|
|
png_voidp error_ptr; /* user supplied struct for error functions */
|
|
png_rw_ptr write_data_fn; /* function for writing output data */
|
|
png_rw_ptr read_data_fn; /* function for reading input data */
|
|
png_voidp io_ptr; /* ptr to application struct for I/O functions*/
|
|
|
|
png_uint_32 mode; /* tells us whre we are in the PNG file */
|
|
png_uint_32 flags; /* flags indicating various things to libpng */
|
|
png_uint_32 transformations; /* which transformations to perform */
|
|
|
|
z_stream zstream; /* pointer to decompression structure (below) */
|
|
png_bytep zbuf; /* buffer for zlib */
|
|
png_size_t zbuf_size; /* size of zbuf */
|
|
int zlib_level; /* holds zlib compression level */
|
|
int zlib_method; /* holds zlib compression method */
|
|
int zlib_window_bits; /* holds zlib compression window bits */
|
|
int zlib_mem_level; /* holds zlib compression memory level */
|
|
int zlib_strategy; /* holds zlib compression strategy */
|
|
|
|
png_uint_32 width; /* width of image in pixels */
|
|
png_uint_32 height; /* height of image in pixels */
|
|
png_uint_32 num_rows; /* number of rows in current pass */
|
|
png_uint_32 usr_width; /* width of row at start of write */
|
|
png_size_t rowbytes; /* size of row in bytes */
|
|
png_size_t irowbytes; /* size of current interlaced row in bytes */
|
|
png_uint_32 iwidth; /* width of current interlaced row in pixels */
|
|
png_uint_32 row_number; /* current row in interlace pass */
|
|
png_bytep prev_row; /* buffer to save previous (unfiltered) row */
|
|
png_bytep row_buf; /* buffer to save current (unfiltered) row */
|
|
png_bytep sub_row; /* buffer to save "sub" row when filtering */
|
|
png_bytep up_row; /* buffer to save "up" row when filtering */
|
|
png_bytep avg_row; /* buffer to save "avg" row when filtering */
|
|
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
|
|
png_row_info row_info; /* used for transformation routines */
|
|
|
|
png_uint_32 idat_size; /* current IDAT size for read */
|
|
png_uint_32 crc; /* current chunk CRC value */
|
|
png_colorp palette; /* palette from the input file */
|
|
png_uint_16 num_palette; /* number of color entries in palette */
|
|
png_uint_16 num_trans; /* number of transparency values */
|
|
png_byte chunk_name[5]; /* null-terminated name of current chunk */
|
|
png_byte compression; /* file compression type (always 0) */
|
|
png_byte filter; /* file filter type (always 0) */
|
|
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
png_byte pass; /* current interlace pass (0 - 6) */
|
|
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
|
|
png_byte color_type; /* color type of file */
|
|
png_byte bit_depth; /* bit depth of file */
|
|
png_byte usr_bit_depth; /* bit depth of users row */
|
|
png_byte pixel_depth; /* number of bits per pixel */
|
|
png_byte channels; /* number of channels in file */
|
|
png_byte usr_channels; /* channels at start of write */
|
|
png_byte sig_bytes; /* magic bytes read/written from start of file */
|
|
|
|
|
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
png_byte filler; /* filler byte for 24->32-bit pixel expansion */
|
|
#endif /* PNG_READ_FILLER_SUPPORTED */
|
|
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
png_byte background_gamma_type;
|
|
float background_gamma;
|
|
png_color_16 background; /* background color in screen gamma space */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
png_color_16 background_1; /* background normalized to gamma 1.0 */
|
|
#endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */
|
|
#endif /* PNG_READ_bKGD_SUPPORTED */
|
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
png_flush_ptr output_flush_fn;/* Function for flushing output */
|
|
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
|
|
png_uint_32 flush_rows; /* number of rows written since last flush */
|
|
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
|
|
float gamma; /* file gamma value */
|
|
float display_gamma; /* display gamma value */
|
|
#endif /* PNG_READ_GAMMA_SUPPORTED */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_bytep gamma_table; /* gamma table for 8 bit depth files */
|
|
png_bytep gamma_from_1; /* converts from 1.0 to screen */
|
|
png_bytep gamma_to_1; /* converts from file to 1.0 */
|
|
png_uint_16pp gamma_16_table; /* gamma table for 16 bit depth files */
|
|
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
|
|
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
|
|
#endif /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED)
|
|
png_color_8 sig_bit; /* significant bits in each available channel */
|
|
#endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
png_color_8 shift; /* shift for significant bit tranformation */
|
|
#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_bytep trans; /* transparency values for paletted files */
|
|
png_color_16 trans_values; /* transparency values for non-paletted files */
|
|
#endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
png_progressive_info_ptr info_fn; /* called after header data fully read */
|
|
png_progressive_row_ptr row_fn; /* called after each row is decoded */
|
|
png_progressive_end_ptr end_fn; /* called after image is complete */
|
|
png_bytep save_buffer_ptr; /* current location in save_buffer */
|
|
png_bytep save_buffer; /* buffer for previously read data */
|
|
png_bytep current_buffer_ptr; /* current location in current_buffer */
|
|
png_bytep current_buffer; /* buffer for recently used data */
|
|
png_uint_32 push_length; /* size of current input chunk */
|
|
png_uint_32 skip_length; /* bytes to skip in input data */
|
|
png_size_t save_buffer_size; /* amount of data now in save_buffer */
|
|
png_size_t save_buffer_max; /* total size of save_buffer */
|
|
png_size_t buffer_size; /* total amount of available input data */
|
|
png_size_t current_buffer_size; /* amount of data now in current_buffer */
|
|
int process_mode; /* what push library is currently doing */
|
|
int cur_palette; /* current push library palette index */
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
|
|
png_size_t current_text_size; /* current size of text input data */
|
|
png_size_t current_text_left; /* how much text left to read in input */
|
|
png_charp current_text; /* current text chunk buffer */
|
|
png_charp current_text_ptr; /* current location in current_text */
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_SUPPORTED */
|
|
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
|
|
/* for the Borland special 64K segment handler */
|
|
png_bytepp offset_table_ptr;
|
|
png_bytep offset_table;
|
|
png_uint_16 offset_table_number;
|
|
png_uint_16 offset_table_count;
|
|
png_uint_16 offset_table_count_free;
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED&&__TURBOC__&&!_Windows&&!__FLAT__ */
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
png_bytep palette_lookup; /* lookup table for dithering */
|
|
png_bytep dither_index; /* index translation for palette files */
|
|
png_uint_16p hist; /* histogram */
|
|
#endif /* PNG_READ_DITHER_SUPPORTED */
|
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
|
|
png_byte heuristic_method; /* heuristic for row filter selection */
|
|
png_byte num_prev_filters; /* number of weights for previous rows */
|
|
png_bytep prev_filters; /* filter type(s) of previous row(s) */
|
|
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
|
|
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
|
|
png_uint_16p filter_costs; /* relative filter calculation cost */
|
|
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
|
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
};
|
|
|
|
typedef png_struct FAR * FAR * png_structpp;
|
|
|
|
/* Here are the function definitions most commonly used. This is not
|
|
* the place to find out how to use libpng. See libpng.txt for the
|
|
* full explanation, see example.c for the summary. This just provides
|
|
* a simple one line of the use of each function.
|
|
*/
|
|
|
|
/* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|
* Handling more than 8 bytes from the beginning of the file is an error.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
|
|
int num_bytes));
|
|
|
|
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|
* signature, and non-zero otherwise. Having num_to_check == 0 or
|
|
* start > 7 will always fail (ie return non-zero).
|
|
*/
|
|
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
|
|
png_size_t num_to_check));
|
|
|
|
/* Simple signature checking function. This is the same as calling
|
|
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
|
|
*/
|
|
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
|
|
|
|
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|
extern PNG_EXPORT(png_structp,png_create_read_struct)
|
|
PNGARG((png_charp user_png_ver, voidp error_ptr, png_error_ptr error_fn,
|
|
png_error_ptr warn_fn));
|
|
|
|
/* Allocate and initialize png_ptr struct for reading, and any other memory */
|
|
extern PNG_EXPORT(png_structp,png_create_write_struct)
|
|
PNGARG((png_const_charp user_png_ver, voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn));
|
|
|
|
/* Allocate and initialize the info structure */
|
|
extern PNG_EXPORT(png_infop,png_create_info_struct)
|
|
PNGARG((png_structp png_ptr));
|
|
|
|
/* Initialize the info structure (old interface - NOT DLL EXPORTED) */
|
|
extern void png_info_init PNGARG((png_infop info_ptr));
|
|
|
|
/* Writes all the PNG information before the image. */
|
|
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* read the information before the actual image data. */
|
|
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
|
/* convert from a struct tm to png_time */
|
|
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
|
|
struct tm FAR * ttime));
|
|
|
|
/* convert from time_t to png_time. Uses gmtime() */
|
|
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
|
|
time_t ttime));
|
|
#endif /* PNG_WRITE_tIME_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
/* Expand data to 24 bit RGB, or 8 bit grayscale, with alpha if available. */
|
|
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_EXPAND_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
/* Use blue, green, red order for pixels. */
|
|
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
/* Expand the grayscale to 24 bit RGB if necessary. */
|
|
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
/* Reduce RGB to grayscale. (Not yet implemented) */
|
|
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */
|
|
|
|
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
|
|
png_colorp palette));
|
|
|
|
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
|
|
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
/* Add a filler byte to 24-bit RGB images. */
|
|
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
|
|
png_uint_32 filler, int flags));
|
|
|
|
/* The values of the PNG_FILLER_ defines should NOT be changed */
|
|
#define PNG_FILLER_BEFORE 0
|
|
#define PNG_FILLER_AFTER 1
|
|
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
/* Swap bytes in 16 bit depth files. */
|
|
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|
/* Use 1 byte per pixel in 1, 2, or 4 bit depth files. */
|
|
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR)
|
|
/* Swap packing order of pixels in bytes. */
|
|
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */
|
|
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
/* Converts files to legal bit depths. */
|
|
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
|
|
png_color_8p true_bits));
|
|
#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
|
|
defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
/* Have the code handle the interlacing. Returns the number of passes. */
|
|
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
/* Invert monocrome files */
|
|
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
/* Handle alpha and tRNS by replacing with a background color. */
|
|
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
|
|
png_color_16p background_color, int background_gamma_code,
|
|
int need_expand, double background_gamma));
|
|
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
|
|
#define PNG_BACKGROUND_GAMMA_SCREEN 1
|
|
#define PNG_BACKGROUND_GAMMA_FILE 2
|
|
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
|
|
#endif /* PNG_READ_BACKGROUND_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
/* strip the second byte of information from a 16 bit depth file. */
|
|
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_READ_16_TO_8_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
/* Turn on dithering, and reduce the palette to the number of colors available. */
|
|
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
|
|
png_colorp palette, int num_palette, int maximum_colors,
|
|
png_uint_16p histogram, int full_dither));
|
|
#endif /* PNG_READ_DITHER_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
/* Handle gamma correction. */
|
|
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
|
|
double screen_gamma, double default_file_gamma));
|
|
#endif /* PNG_READ_GAMMA_SUPPORTED */
|
|
|
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
/* Set how many lines between output flushes - 0 for no flushing */
|
|
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
|
|
|
|
/* Flush the current PNG output buffer */
|
|
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
|
|
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
|
|
|
|
/* optional update palette with requested transformations */
|
|
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
|
|
|
|
/* optional call to update the users info structure */
|
|
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* read a one or more rows of image data.*/
|
|
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
|
|
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
|
|
|
|
/* read a row of data.*/
|
|
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
|
|
png_bytep row,
|
|
png_bytep display_row));
|
|
|
|
/* read the whole image into memory at once. */
|
|
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
|
|
png_bytepp image));
|
|
|
|
/* write a row of image data */
|
|
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
|
|
png_bytep row));
|
|
|
|
/* write a few rows of image data */
|
|
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
|
|
png_bytepp row, png_uint_32 num_rows));
|
|
|
|
/* write the image data */
|
|
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
|
|
png_bytepp image));
|
|
|
|
/* writes the end of the PNG file. */
|
|
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* read the end of the PNG file. */
|
|
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* free any memory associated with the png_info_struct */
|
|
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
|
|
png_infopp info_ptr_ptr));
|
|
|
|
/* free any memory associated with the png_struct and the png_info_structs */
|
|
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
|
|
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
|
|
|
|
/* free all memory used by the read (old method - NOT DLL EXPORTED) */
|
|
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_infop end_info_ptr));
|
|
|
|
/* free any memory associated with the png_struct and the png_info_structs */
|
|
extern PNG_EXPORT(void,png_destroy_write_struct)
|
|
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
|
|
|
|
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
|
|
extern void png_write_destroy PNGARG((png_structp png_ptr));
|
|
|
|
/* set the libpng method of handling chunk CRC errors */
|
|
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
|
|
int crit_action, int ancil_action));
|
|
|
|
/* Values for png_set_crc_action() to say how to handle CRC errors in
|
|
* ancillary and critical chunks, and whether to use the data contained
|
|
* therein. Note that it is impossible to "discard" data in a critical
|
|
* chunk. For versions prior to 0.90, the action was always error/quit,
|
|
* whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|
* chunks is warn/discard. These values should NOT be changed.
|
|
*
|
|
* value action:critical action:ancillary
|
|
*/
|
|
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
|
|
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
|
|
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
|
|
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
|
|
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
|
|
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
|
|
|
|
/* These functions give the user control over the scan-line filtering in
|
|
* libpng and the compression methods used by zlib. These functions are
|
|
* mainly useful for testing, as the defaults should work with most users.
|
|
* Those users who are tight on memory or want faster performance at the
|
|
* expense of compression can modify them. See the compression library
|
|
* header file (zlib.h) for an explination of the compression functions. */
|
|
|
|
/* set the filtering method(s) used by libpng. Currently, the only valid
|
|
* value for "method" is 0 */
|
|
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
|
|
int filters));
|
|
|
|
/* Flags for png_set_filter() to say which filters to use. The flags
|
|
* are chosen so that they don't conflict with real filter types
|
|
* below, in case they are supplied instead of the #defined constants.
|
|
* These values should NOT be changed.
|
|
*/
|
|
#define PNG_NO_FILTERS 0x00
|
|
#define PNG_FILTER_NONE 0x08
|
|
#define PNG_FILTER_SUB 0x10
|
|
#define PNG_FILTER_UP 0x20
|
|
#define PNG_FILTER_AVG 0x40
|
|
#define PNG_FILTER_PAETH 0x80
|
|
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
|
|
PNG_FILTER_AVG | PNG_FILTER_PAETH)
|
|
|
|
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|
* These defines should NOT be changed.
|
|
*/
|
|
#define PNG_FILTER_VALUE_NONE 0
|
|
#define PNG_FILTER_VALUE_SUB 1
|
|
#define PNG_FILTER_VALUE_UP 2
|
|
#define PNG_FILTER_VALUE_AVG 3
|
|
#define PNG_FILTER_VALUE_PAETH 4
|
|
#define PNG_FILTER_VALUE_LAST 5
|
|
|
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
|
|
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|
* defines, either the default (minimum-sum-of-absolute-differences), or
|
|
* the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|
*
|
|
* Weights are factors >= 1.0, indicating how important it is to keep the
|
|
* filter type consistent between rows. Larger numbers mean the current
|
|
* filter is that many times as likely to be the same as the "num_weights"
|
|
* previous filters. This is cumulative for each previous row with a weight.
|
|
* There needs to be "num_weights" values in "filter_weights", or it can be
|
|
* NULL if the weights aren't being specified. Weights have no influence on
|
|
* the selection of the first row filter. Well chosen weights can (in theory)
|
|
* improve the compression for a given image.
|
|
*
|
|
* Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|
* filter type. Higher costs indicate more decoding expense, and are
|
|
* therefore less likely to be selected over a filter with lower computational
|
|
* costs. There needs to be a value in "filter_costs" for each valid filter
|
|
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|
* setting the costs. Costs try to improve the speed of decompression without
|
|
* unduly increasing the compressed image size.
|
|
*
|
|
* A negative weight or cost indicates the default value is to be used, and
|
|
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|
* The default values for both weights and costs are currently 1.0, but may
|
|
* change if good general weighting/cost heuristics can be found. If both
|
|
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|
* to the UNWEIGHTED method, but with added encoding time/computation.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
|
|
int heuristic_method, int num_weights, png_doublep filter_weights,
|
|
png_doublep filter_costs));
|
|
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
|
|
/* Heuristic used for row filter selection. These defines should NOT be
|
|
* changed.
|
|
*/
|
|
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
|
|
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
|
|
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
|
|
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
|
|
|
|
/* Set the library compression level. Currently, valid values range from
|
|
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|
* (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|
* shown that zlib compression levels 3-6 usually perform as well as level 9
|
|
* for PNG images, and do considerably fewer caclulations. In the future,
|
|
* these values may not correspond directly to the zlib compression levels.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
|
|
int level));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_mem_level)
|
|
PNGARG((png_structp png_ptr, int mem_level));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_strategy)
|
|
PNGARG((png_structp png_ptr, int strategy));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_window_bits)
|
|
PNGARG((png_structp png_ptr, int window_bits));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
|
|
int method));
|
|
|
|
/* These next functions are called for input/output, memory, and error
|
|
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|
* and call standard C I/O routines such as fread(), fwrite(), and
|
|
* fprintf(). These functions can be made to use other I/O routines
|
|
* at run time for those applications that need to handle I/O in a
|
|
* different manner by calling png_set_???_fn(). See libpng.txt for
|
|
* more information.
|
|
*/
|
|
|
|
/* Initialize the input/output for the PNG file to the default functions. */
|
|
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
|
|
|
|
/* Replace the (error and abort), and warning functions with user
|
|
* supplied functions. If no messages are to be printed you must still
|
|
* write and use replacement functions. The replacement error_fn should
|
|
* still do a longjmp to the last setjmp location if you are using this
|
|
* method of error handling. If error_fn or warning_fn is NULL, the
|
|
* default function will be used.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
|
|
|
|
/* Return the user pointer associated with the error functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
|
|
|
|
/* Replace the default data output functions with a user supplied one(s).
|
|
* If buffered output is not used, then output_flush_fn can be set to NULL.
|
|
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|
* output_flush_fn will be ignored (and thus can be NULL).
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
|
|
|
|
/* Replace the default data input function with a user supplied one. */
|
|
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp io_ptr, png_rw_ptr read_data_fn));
|
|
|
|
/* Return the user pointer associated with the I/O functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
/* Sets the function callbacks for the push reader, and a pointer to a
|
|
* user-defined structure available to the callback functions.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp progressive_ptr,
|
|
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
|
|
png_progressive_end_ptr end_fn));
|
|
|
|
/* returns the user pointer associated with the push read functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
|
|
PNGARG((png_structp png_ptr));
|
|
|
|
/* function to be called when data becomes available */
|
|
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
|
|
|
|
/* function which combines rows. Not very much different than the
|
|
* png_combine_row() call. Is this even used?????
|
|
*/
|
|
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
|
|
png_bytep old_row, png_bytep new_row));
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
|
|
png_uint_32 size));
|
|
|
|
/* free's a pointer allocated by png_malloc() */
|
|
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
|
|
|
|
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
|
|
extern void *far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,int check));
|
|
#endif /* USE_FAR_KEYWORD */
|
|
|
|
/* Fatal error in PNG image of libpng - can't continue */
|
|
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
|
|
png_const_charp error));
|
|
|
|
/* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
|
|
png_const_charp message));
|
|
|
|
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|
* Similarly, the png_get_<chunk> calls are used to read values from the
|
|
* png_info_struct, either storing the parameters in the passed variables, or
|
|
* setting pointers into the png_info_struct where the data is stored. The
|
|
* png_get_<chunk> functions return a non-zero value if the data was available
|
|
* in info_ptr, or return zero and do not change any of the parameters if the
|
|
* data was not available.
|
|
*
|
|
* These functions should be used instead of directly accessing png_info
|
|
* to avoid problems with future changes in the size and internal layout of
|
|
* png_info_struct.
|
|
*/
|
|
/* Returns "flag" if chunk data is valid in info_ptr */
|
|
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 flag));
|
|
|
|
/* Returns number of bytes needed to hold a transformed row */
|
|
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* Returns number of color channels in image */
|
|
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* Returns pointer to signature string read from PNG header */
|
|
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_16p *background));
|
|
#endif /* PNG_READ_bKGD_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_16p background));
|
|
#endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_cHRM_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|
double *red_y, double *green_x, double *green_y, double *blue_x,
|
|
double *blue_y));
|
|
#endif /* PNG_READ_cHRM_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double white_x, double white_y, double red_x,
|
|
double red_y, double green_x, double green_y, double blue_x, double blue_y));
|
|
#endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_gAMA_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double *file_gamma));
|
|
#endif /* PNG_READ_gAMA_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double file_gamma));
|
|
#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_16p *hist));
|
|
#endif /* PNG_READ_hIST_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_16p hist));
|
|
#endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
|
|
|
|
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
|
|
int *bit_depth, int *color_type, int *interlace_type,
|
|
int *compression_type, int *filter_type));
|
|
|
|
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
|
|
int color_type, int interlace_type, int compression_type, int filter_type));
|
|
|
|
#if defined(PNG_READ_oFFs_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y,
|
|
int *unit_type));
|
|
#endif /* PNG_READ_oFFs_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y,
|
|
int unit_type));
|
|
#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
|
|
int *type, int *nparams, png_charp *units, png_charpp *params));
|
|
#endif /* PNG_READ_pCAL_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
|
|
int type, int nparams, png_charp units, png_charpp params));
|
|
#endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_pHYs_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
#endif /* PNG_READ_pHYs_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
|
|
#endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
|
|
|
|
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_colorp *palette, int *num_palette));
|
|
|
|
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_colorp palette, int num_palette));
|
|
|
|
#if defined(PNG_READ_sBIT_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_8p *sig_bit));
|
|
#endif /* PNG_READ_sBIT_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_8p sig_bit));
|
|
#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
|
|
/* png_get_text also returns the number of text chunks in text_ptr */
|
|
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_textp *text_ptr, int *num_text));
|
|
#endif /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
|
|
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_textp text_ptr, int num_text));
|
|
#endif /* PNG_READ_tEXt_SUPPORTED || PNG_WRITE_tEXt_SUPPORTED ||
|
|
PNG_READ_zTXt_SUPPORTED || PNG_WRITE_zTXt_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_timep *mod_time));
|
|
#endif /* PNG_READ_tIME_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_timep mod_time));
|
|
#endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep *trans, int *num_trans,
|
|
png_color_16p *trans_values));
|
|
#endif /* PNG_READ_tRNS_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep trans, int num_trans,
|
|
png_color_16p trans_values));
|
|
#endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
|
|
|
|
/* Define PNG_DEBUG at compile time for debugging information. Higher
|
|
* numbers for PNG_DEBUG mean more debugging information. This has
|
|
* only been added since version 0.95 so it is not implemented throughout
|
|
* libpng yet, but more support will be added as needed.
|
|
*/
|
|
#if (PNG_DEBUG > 0)
|
|
#ifndef PNG_DEBUG_FILE
|
|
#define PNG_DEBUG_FILE stderr
|
|
#endif /* PNG_DEBUG_FILE */
|
|
|
|
#define png_debug(l,m) if (PNG_DEBUG > l) \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
|
|
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))))
|
|
#define png_debug1(l,m,p1) if (PNG_DEBUG > l) \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
|
|
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1)
|
|
#define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
|
|
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1,p2)
|
|
#else
|
|
#define png_debug(l, m)
|
|
#define png_debug1(l, m, p1)
|
|
#define png_debug2(l, m, p1, p2)
|
|
#endif /* (PNG_DEBUG > 0) */
|
|
|
|
/* These next functions are used internally in the code. They generally
|
|
* shouldn't be used unless you are writing code to add or replace some
|
|
* functionality in libpng. More information about most functions can
|
|
* be found in the files where the functions are located.
|
|
*/
|
|
|
|
#if defined(PNG_INTERNAL)
|
|
|
|
/* Various modes of operation. Note that after an init, mode is set to
|
|
zero automatically when the structure is created. */
|
|
#define PNG_BEFORE_IHDR 0x00
|
|
#define PNG_HAVE_IHDR 0x01
|
|
#define PNG_HAVE_PLTE 0x02
|
|
#define PNG_HAVE_IDAT 0x04
|
|
#define PNG_AFTER_IDAT 0x08
|
|
#define PNG_HAVE_IEND 0x10
|
|
|
|
/* push model modes */
|
|
#define PNG_READ_SIG_MODE 0
|
|
#define PNG_READ_CHUNK_MODE 1
|
|
#define PNG_READ_IDAT_MODE 2
|
|
#define PNG_SKIP_MODE 3
|
|
#define PNG_READ_tEXt_MODE 4
|
|
#define PNG_READ_zTXt_MODE 5
|
|
#define PNG_READ_DONE_MODE 6
|
|
#define PNG_ERROR_MODE 7
|
|
|
|
/* flags for the transformations the PNG library does on the image data */
|
|
#define PNG_BGR 0x0001
|
|
#define PNG_INTERLACE 0x0002
|
|
#define PNG_PACK 0x0004
|
|
#define PNG_SHIFT 0x0008
|
|
#define PNG_SWAP_BYTES 0x0010
|
|
#define PNG_INVERT_MONO 0x0020
|
|
#define PNG_DITHER 0x0040
|
|
#define PNG_BACKGROUND 0x0080
|
|
#define PNG_BACKGROUND_EXPAND 0x0100
|
|
#define PNG_RGB_TO_GRAY 0x0200 /* Not currently implemented */
|
|
#define PNG_16_TO_8 0x0400
|
|
#define PNG_RGBA 0x0800
|
|
#define PNG_EXPAND 0x1000
|
|
#define PNG_GAMMA 0x2000
|
|
#define PNG_GRAY_TO_RGB 0x4000
|
|
#define PNG_FILLER 0x8000
|
|
#define PNG_PACKSWAP 0x10000
|
|
#define PNG_SWAP_ALPHA 0x20000
|
|
#define PNG_STRIP_ALPHA 0x40000
|
|
|
|
/* flags for png_create_struct */
|
|
#define PNG_STRUCT_PNG 0x0001
|
|
#define PNG_STRUCT_INFO 0x0002
|
|
|
|
/* Scaling factor for filter heuristic weighting calculations */
|
|
#define PNG_WEIGHT_SHIFT 8
|
|
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
|
|
#define PNG_COST_SHIFT 3
|
|
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
|
|
|
|
/* flags for the png_ptr->flags rather than declaring a byte for each one */
|
|
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
|
|
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
|
|
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
|
|
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
|
|
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
|
|
#define PNG_FLAG_ZLIB_FINISHED 0x0020
|
|
#define PNG_FLAG_ROW_INIT 0x0040
|
|
#define PNG_FLAG_FILLER_AFTER 0x0080
|
|
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
|
|
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
|
|
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
|
|
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
|
|
#define PNG_FLAG_FREE_PALETTE 0x1000
|
|
#define PNG_FLAG_FREE_TRANS 0x2000
|
|
#define PNG_FLAG_FREE_HIST 0x4000
|
|
#define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000
|
|
#define PNG_FLAG_WROTE_tIME 0x10000
|
|
|
|
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
|
|
PNG_FLAG_CRC_ANCILLARY_NOWARN)
|
|
|
|
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
|
|
PNG_FLAG_CRC_CRITICAL_IGNORE)
|
|
|
|
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
|
|
PNG_FLAG_CRC_CRITICAL_MASK)
|
|
|
|
/* save typing and make code easier to understand */
|
|
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
|
|
abs((int)((c1).green) - (int)((c2).green)) + \
|
|
abs((int)((c1).blue) - (int)((c2).blue)))
|
|
|
|
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|
#ifndef PNG_NO_EXTERN
|
|
/* place to hold the signiture string for a PNG file. */
|
|
extern png_byte FARDATA png_sig[];
|
|
|
|
/* constant strings for known chunk types. If you need to add a chunk,
|
|
add a string holding the name here. See png.c for more details. We
|
|
can't selectively include these, since we still check for chunk in the
|
|
wrong locations with these labels. */
|
|
extern png_byte FARDATA png_IHDR[];
|
|
extern png_byte FARDATA png_IDAT[];
|
|
extern png_byte FARDATA png_IEND[];
|
|
extern png_byte FARDATA png_PLTE[];
|
|
extern png_byte FARDATA png_bKGD[];
|
|
extern png_byte FARDATA png_cHRM[];
|
|
extern png_byte FARDATA png_gAMA[];
|
|
extern png_byte FARDATA png_hIST[];
|
|
extern png_byte FARDATA png_oFFs[];
|
|
extern png_byte FARDATA png_pCAL[];
|
|
extern png_byte FARDATA png_pHYs[];
|
|
extern png_byte FARDATA png_sBIT[];
|
|
extern png_byte FARDATA png_tEXt[];
|
|
extern png_byte FARDATA png_tIME[];
|
|
extern png_byte FARDATA png_tRNS[];
|
|
extern png_byte FARDATA png_zTXt[];
|
|
|
|
#endif /* PNG_NO_EXTERN */
|
|
|
|
/* Inline macros to do direct reads of bytes from the input buffer. These
|
|
* require that you are using an architecture that uses PNG byte ordering
|
|
* (MSB first) and supports unaligned data storage. I think that PowerPC
|
|
* in big-endian mode and 680x0 are the only ones that will support this.
|
|
* The x86 line of processors definitely do not. The png_get_int_32()
|
|
* routine also assumes we are using two's complement format for negative
|
|
* values, which is almost certainly true.
|
|
*/
|
|
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
#define png_get_int_32(buf) ( *((png_int_32p) (buf)))
|
|
#endif /* PNG_READ_pCAL_SUPPORTED */
|
|
#define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
|
|
#define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
|
|
#else
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
|
|
#endif /* PNG_READ_pCAL_SUPPORTED */
|
|
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
|
|
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
|
|
#endif /* PNG_BIG_ENDIAN_GET_SUPPORTED */
|
|
|
|
/* Initialize png_ptr struct for reading, and allocate any other memory
|
|
* (old interface - NOT DLL EXPORTED) */
|
|
extern void png_read_init PNGARG((png_structp png_ptr));
|
|
|
|
/* Initialize png_ptr struct for writing, and allocate any other memory
|
|
* (old interface - NOT DLL EXPORTED) */
|
|
extern void png_write_init PNGARG((png_structp png_ptr));
|
|
|
|
/* allocate memory for an internal libpng struct */
|
|
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
|
|
|
|
/* free memory from internal libpng struct */
|
|
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
|
|
|
|
/* free any memory that info_ptr points to and reset struct. */
|
|
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* Function to allocate memory for zlib. */
|
|
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
|
|
|
|
/* function to free memory for zlib */
|
|
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
|
|
|
|
/* reset the CRC variable */
|
|
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
|
|
|
|
/* Write the "data" buffer to whatever output you are using. */
|
|
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
/* Read data from whatever input you are using into the "data" buffer */
|
|
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
/* read bytes into buf, and update png_ptr->crc */
|
|
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
|
|
png_size_t length));
|
|
|
|
/* read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
|
|
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
|
|
|
|
/* read the CRC from the file and compare it to the libpng calculated CRC */
|
|
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
|
|
|
|
/* Calculate the CRC over a section of data. Note that we are only
|
|
* passing a maximum of 64K on systems that have this as a memory limit,
|
|
* since this is the maximum buffer size we can specify.
|
|
*/
|
|
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
|
|
png_size_t length));
|
|
|
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
|
|
* The only currently known PNG chunk that uses unsigned numbers is
|
|
* the ancillary extension chunk, pCAL.
|
|
*/
|
|
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
|
|
|
|
#if defined(PNG_WRITE_pCAL_SUPPORTED)
|
|
PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
|
|
#endif
|
|
|
|
/* place a 16 bit number into a buffer in PNG byte order */
|
|
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, png_uint_16 i));
|
|
|
|
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|
PNG_EXTERN void png_write_chunk PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name, png_bytep data, png_size_t length));
|
|
|
|
/* Write the start of a PNG chunk - length and chunk name. */
|
|
PNG_EXTERN void png_write_chunk_start PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name, png_uint_32 length));
|
|
|
|
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|
PNG_EXTERN void png_write_chunk_data PNGARG((png_structp png_ptr,
|
|
png_bytep data, png_size_t length));
|
|
|
|
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|
PNG_EXTERN void png_write_chunk_end PNGARG((png_structp png_ptr));
|
|
|
|
/* simple function to write the signiture */
|
|
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
|
|
|
|
/* write various chunks */
|
|
|
|
/* Write the IHDR chunk, and update the png_struct with the necessary
|
|
information. */
|
|
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
|
|
png_uint_32 height,
|
|
int bit_depth, int color_type, int compression_type, int filter_type,
|
|
int interlace_type));
|
|
|
|
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
|
|
png_uint_32 num_pal));
|
|
|
|
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
|
|
|
|
#if defined(PNG_WRITE_gAMA_SUPPORTED)
|
|
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_sBIT_SUPPORTED)
|
|
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
|
|
int color_type));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_cHRM_SUPPORTED)
|
|
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
|
|
double white_x, double white_y,
|
|
double red_x, double red_y, double green_x, double green_y,
|
|
double blue_x, double blue_y));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_tRNS_SUPPORTED)
|
|
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
|
|
png_color_16p values, int number, int color_type));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_bKGD_SUPPORTED)
|
|
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
|
|
png_color_16p values, int color_type));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_hIST_SUPPORTED)
|
|
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
|
|
png_uint_32 num_hist));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
|
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
|
|
png_charp key, png_bytepp new_key));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_tEXt_SUPPORTED)
|
|
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
|
|
png_charp text, png_size_t text_len));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_zTXt_SUPPORTED)
|
|
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
|
|
png_charp text, png_size_t text_len, int compression));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_oFFs_SUPPORTED)
|
|
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
|
|
png_uint_32 x_offset, png_uint_32 y_offset, int unit_type));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_pCAL_SUPPORTED)
|
|
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
|
|
png_int_32 X0, png_int_32 X1, int type, int nparams,
|
|
png_charp units, png_charpp params));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_pHYs_SUPPORTED)
|
|
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
|
|
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
|
|
int unit_type));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
|
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
|
|
png_timep mod_time));
|
|
#endif
|
|
|
|
/* Called when finished processing a row of data */
|
|
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
|
|
|
|
/* Internal use only. Called before first row of data */
|
|
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
/* combine a row of data, dealing with alpha, etc. if requested */
|
|
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
|
|
int mask));
|
|
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED)
|
|
/* expand an interlaced row */
|
|
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
|
|
png_bytep row, int pass, png_uint_32 transformations));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
/* grab pixels out of a row for an interlaced pass */
|
|
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
|
|
png_bytep row, int pass));
|
|
#endif
|
|
|
|
/* unfilter a row */
|
|
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
|
|
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
|
|
|
|
/* Choose the best filter to use and filter the row data */
|
|
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
|
|
png_row_infop row_info));
|
|
|
|
/* Write out the filtered row. */
|
|
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
|
|
png_bytep filtered_row));
|
|
/* finish a row while reading, dealing with interlacing passes, etc. */
|
|
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
|
|
|
|
/* initialize the row buffers, etc. */
|
|
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
|
|
/* optional call to update the users info structure */
|
|
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* these are the functions that do the transformations */
|
|
#if defined(PNG_READ_FILLER_SUPPORTED)
|
|
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 filler, png_uint_32 flags));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
|
|
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
|
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 flags));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR)
|
|
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
PNG_EXTERN void png_do_rgb_to_gray PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PACK_SUPPORTED)
|
|
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_8p sig_bits));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
|
|
|
|
# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
|
|
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
|
|
png_colorp palette, int num_palette));
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_PACK_SUPPORTED)
|
|
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 bit_depth));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_8p bit_depth));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_16p trans_values, png_color_16p background,
|
|
png_color_16p background_1,
|
|
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
|
|
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
|
|
png_uint_16pp gamma_16_to_1, int gamma_shift));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_bytep gamma_table, png_uint_16pp gamma_16_table,
|
|
int gamma_shift));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
|
|
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_color_16p trans_value));
|
|
#endif
|
|
|
|
/* The following decodes the appropriate chunks, and does error correction,
|
|
* then calls the appropriate callback for the chunk if it is valid */
|
|
|
|
/* decode the IHDR chunk */
|
|
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
|
|
#if defined(PNG_READ_gAMA_SUPPORTED)
|
|
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_sBIT_SUPPORTED)
|
|
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_cHRM_SUPPORTED)
|
|
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_oFFs_SUPPORTED)
|
|
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_pHYs_SUPPORTED)
|
|
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
|
|
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name));
|
|
|
|
/* handle the transformations for reading and writing */
|
|
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
|
|
|
|
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t length));
|
|
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t buffer_length));
|
|
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t buffer_length));
|
|
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
|
|
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
|
|
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
#endif
|
|
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
#endif
|
|
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
#endif /* PNG_INTERNAL */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/* do not put anything past this line */
|
|
#endif /* _PNG_H */
|